/*
** $Id: ldo.h,v 2.29.1.1 2017/04/19 17:20:42 roberto Exp $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/

#ifndef ldo_h
#define ldo_h

#include "lobject.h"
#include "lstate.h"
#include "lzio.h"

/*
** Macro to check stack size and grow stack if needed.  Parameters
** 'pre'/'pos' allow the macro to preserve a pointer into the
** stack across reallocations, doing the work only when needed.
** 'condmovestack' is used in heavy tests to force a stack reallocation
** at every check.
*/
#define luaD_checkstackaux(L, n, pre, pos) \
  if (L->stack_last - L->top <= (n)) { \
    pre; \
    luaD_growstack(L, n); \
    pos; \
  } else { \
    condmovestack(L, pre, pos); \
  }

/* In general, 'pre'/'pos' are empty (nothing to save) */
#define luaD_checkstack(L, n) luaD_checkstackaux(L, n, (void)0, (void)0)

// save and restore with ptrdiff_t across stack reallocation
#define savestack(L, p) ((char*)(p) - (char*)L->stack)
#define restorestack(L, n) ((TValue*)((char*)L->stack + (n)))

/* type of protected functions, to be ran by 'runprotected' */
typedef void (*Pfunc)(lua_State* L, void* ud);

LUAI_FUNC int luaD_protectedparser(lua_State* L, ZIO* z, const char* name, const char* mode);
LUAI_FUNC void luaD_hook(lua_State* L, int event, int line);
LUAI_FUNC int luaD_precall(lua_State* L, StkId func, int nresults);
LUAI_FUNC void luaD_call(lua_State* L, StkId func, int nResults);
LUAI_FUNC void luaD_callnoyield(lua_State* L, StkId func, int nResults);
LUAI_FUNC int luaD_pcall(lua_State* L, Pfunc func, void* u, ptrdiff_t oldtop, ptrdiff_t ef);
LUAI_FUNC int luaD_poscall(lua_State* L, CallInfo* ci, StkId firstResult, int nres);
LUAI_FUNC void luaD_reallocstack(lua_State* L, int newsize);
LUAI_FUNC void luaD_growstack(lua_State* L, int n);
LUAI_FUNC void luaD_shrinkstack(lua_State* L);
LUAI_FUNC void luaD_inctop(lua_State* L);

LUAI_FUNC l_noret luaD_throw(lua_State* L, int errcode);
LUAI_FUNC int luaD_rawrunprotected(lua_State* L, Pfunc f, void* ud);

#endif
